Prismatic binocular telescope.



N0. 699,168. Patented May 6, 1902.

F. H. HILL. PRISMATIG BINOGULAR TELESCOPE.

(Applicafion filed Sept. 30, 1901.)

(No Model.)

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- UNITED STATES i PATENT OFFICE;

FREDERICK HUMPHREY HILL, OF LONDON, ENGLAND, ASSIGNOR TO THOMAS RUDOLPHUS DALLMEYER, OF OOUN TY OF MIDDLESEX, ENGLAND.

PRISMATIC BINQCULAR: TELESCOPE.

SPECIFICATION forming part of Letters Patent No. 699,168, dated. May 6, 1902.

Application filed September 30, 190lfierial No. 77,068. (No model.)

To all whom it may concern:

Be it known that LFREDERIOK HUMPHREY HILL, electrical engineer, a subject of the King of Great Britain, residing at 298 South Lambeth road, London, England, have in vented certain new and us'efulPrismatic Binocular Telescopes, of which the following is specification.

nected together. The eyepiece-tubes are carried by slides working in guides in one of the plates, so that their distance apart can be varied. The objectives are fixed in tubes which can be moved in and out for focusing in holes or guide-tubes through the other plate, and the prisms are held is speciallyformedqclips pivoted to the plates.

Figurel "is a plan, Fig. 2 an under side View, and Fig. 3 an end elevation, of an instrument constructed according to this invention, the casing being removed.v Figt is a section-on the line 4 4, Figs. 1 and 2.

a. and b are two plates rigidlyconnected by four columns or distance-pieces c. omitted from the middle of Fig. 2.)

d d are the eyepiece-tubes,passing through;

oval slots in the plate a and fixed to slides f, which work in dovetailed guides on the plate at. These slides have on them pins g, entering slots in the thumb-wheelh, pivoted to the plateia,.so that the distance apart of the eyepieces can be varied.

jj are prisms fixed.to-the ends of the eyepiece-tubes d by the straps is.

Z Z are the objective-tubes, passing through holes in the plate band fixed to a nutm. n is a quick-threaded screw-working in the nut m and fixed to the thumb-Wheel o, pivoted to the plate a.

p p are a pair of prisms fixed to the plate I),

and q r are two pairs of prisms fixed to the plate a. Each of these prisms is carried by (One is a holder consisting of a base-plate swith a pair of springs 25 fixed to -it, the base-plate and springs havinghooks at their ends to receive'the edges of the prism. A single spring in place of two may be employed, but not advantageously. 'The base-plates s of the holders are each fixed to the plates or, and b by a single screw a, passing through its center, so that'the prisms may readily be turned about their optical center Without in any way altering their inclination.

What I claim is- 1. In a prismatic binocular telescope, the combination of a framework consisting of two parallel plates rigidly connected together and extending from side to side of the instrument, guides on one of the plates, a slide working in the guides, and an eyepiece-tube fixed to the slide.

2. In a prismatic binocular telescope, the combination of a framework consisting of two parallel plates rigidly connected together and extending from side to side of theinstrument,

I two pairs'of prisms carried by one plate, a

pair of prisms and a pair of objective-tubes carried by the other plate, guideson the first plate, a pair of slides working in'the guides, an eyepiece-tube fixed to each slide, and a prism fixed to each eyepiece-tube.

3. In a prismatic binocular Qtelescope, the combination of a framework consistin g of two parallel plates rigidly connected together and extending from side to side of the instrument, a pair of objective tubes passing through holes in one of theplates, and means for moving the objective-tubes in and out in the holes. a

4. In a prism-holder for a prismatic binocular telescope, the combination of abase-plate, a spring fixed to the base-plate, means on the base-plate and spring suitable for engaging with the edges of the prism; and a pivot'about which the base-plate cantu'rn.

5. In a prismatic bihoculartelescope, the

.combination of a framework consisting of two parallel plates rigidly connected together and extending from side to side of theinstrument, two pairs of prisms carried by one plate, a pair of prisms carried by the other plate, guides on the first plate, a pair of slides working in the guides,- an eyepiece-tube fixed to each slide, a prism fixed to each eyepiecetube,a pair of obj ective-tubes passing through holes in the second plate, and means for moving the objective-tubes in and out in the holes.

6. In a prismatic binocular telescope, the combination of a framework consisting of two parallel plates rigidly connected together and extending from side to side of the instrument, three pairs of prism holders, each prismholder consisting of a base-plate, a spring fixed to the base-plate and means on the baseplate and spring for engaging with the edges of the prisms, prisms in the holders, pivots connecting two pairs of the prism-holders to one plate and one pair to the other plate, guides on the first plate, a pair of slides work- FREDERICK HUMPIIREY HILL.

\Vitnesses:

JAMES HILL, HENRY HILL. 

